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Supplier Data - Polyetheretherketone (PEEK) (Goodfellow)

Background

Polyethetetherketone ( PEEK ) is a high performance thermoplastic with the characteristics common to this group - strong, stiff, hard, high temperature resistance, good chemical resistance and inherently low flammability and smoke emission.

Polyethetetherketone ( PEEK ) is pale amber in colour and usually semi-crystalline and opaque, except thin films are usually amorphous and transparent. Polyethetetherketone ( PEEK ) also has very good resistance to wear, dynamic fatigue and radiation, but it is difficult to process and very expensive. Filled grades, including ones designed for bearing-type applications, are also used.

Applications of Polyethetetherketone ( PEEK ) include flexible printed circuit boards (film), fibres and monofilaments, injection moulded engineering components and items used in aerospace and radiation environments.

Key Properties

The key properties of Polyetheretherketone ( PEEK ) are tabulated below.

Table 1. Key properties

Chemical Resistance
Acids - concentrated Fair
Acids - dilute Good
Alcohols Good
Alkalis Good
Aromatic hydrocarbons Good
Greases and Oils Good
Halogens Good
Ketones Good
Electrical Properties
Dielectric constant @ 1 MHz 3.2-3.3 @ 50 Hz - 10 Khz
Dielectric strength ( kv.mm-1 ) 19 @ 50 µm
Dissipation factor @ 1 MHz 0.003
Volume resistivity ( ohmcm ) 1015 - 1016
Mechanical Properties
Coefficient of friction 0.18
Elongation at break ( % ) 50
Hardness - Rockwell M99
Izod impact strength ( J.m-1 ) 85
Poisson’s ratio 0.4
Tensile modulus ( GPa ) 3.7 - 4.0
Tensile strength ( MPa ) 70-100
Physical Properties
Density ( g.cm-3 ) 1.26 - 1.32
Flammability V-0 @ 1.5 mm
Limiting oxygen index ( % ) 35
Radiation resistance - Alpha Good
Resistance to Ultra-violet Fair
Water absorption - equilibrium ( % ) 0.5
Water absorption - over 24 hours ( % ) 0.1-0.3
Thermal Properties
Coefficient of thermal expansion ( x10-6 K-1 ) 47/108
Heat-deflection temperature - 0.45 MPa ( °C ) >260
Heat-deflection temperature - 1.8 MPa (°C ) 160
Specific heat ( kJ.kg-1.K-1 ) 0.32
Thermal conductivity @ 23 °C ( W.m-1.K-1 ) 0.25
Upper working temperature (°C ) 250
Properties Polyetheretherketone Film
Property   Value
Density g.cm-3 1.26 - amorphous
Dielectric Constant @ 1 MHz   3.3
Dielectric Strength @ 25 µm thick KV.mm-1 110-150
Dissipation Factor @ 1 MHz   0.005
Extension to break - Longitudinal % 240
Extension to break - Transverse % 240
Flammability VTM-1 @ 0.1 mm
Resistencia Corona @ 20 kV mm-1 50 Hz g.µm-1 35-50
Permeability to Oxygen @ 25 C x10-13.cm3.cm.cm-2.s-1.Pa-1 0.06-0.1
Permeability to Water @ 25 C x10-13.cm3.cm.cm-2.s-1.Pa-1 160-300
Shrinkage % 0.5 @ 150 C
Specific Heat kJ.kg-1.K-1 1.45
Tensile modulus - Longitudinal GPa 2.6
Tensile modulus - Transverse GPa 2.6
Tensile strength - Longitudinal MPa 120
Tensile strength - Transverse MPa 120
Properties Polyetheretherketone Fibre
Property   Value
Specific Tenacity cN/tex 61
Density g.cm-3 1.30
Extension to break % 19
Knot Tenacity cN/Tex 36
Loop Tenacity cN/Tex 40
Modulus - 10% GPa 4.2
Modulus - 2% cN/Tex 500
Modulus - 2% GPa 6.5
Modulus - 5% GPa 4.35
Shrinkage @ 180 C % 1.1
Tensile Strength MPa 790
Properties Polyetheretherketone Monofilament
Property   Value
Material   Type A Type B Type C
Density g.cm-3 1.30 1.30 1.30
Extension to break % 38 35 20
Knot Tenacity cN/Tex 28 23 34
Loop Tenacity cN/Tex 25 19 17
Modulus - 10% GPa 1.85 2.8 3.4
Modulus - 2% cN/Tex 382 438 474
Modulus - 2% GPa 5.0 5.7 6.2
Modulus - 5% GPa 2.7 3.7 3.9
Shrinkage @ 180 C % 1.8 8.4 3.0
Tenacity cN/Tex 34 30 60
Tensile Strength GPa 0.44 0.39 0.78

 

 

About Goodfellow

Goodfellow supplies metals, ceramics and other materials to meet the research, development and specialist production requirements of science and industry worldwide.

The Goodfellow group consists of four companies. The main administration, research laboratories and workshops are located at the Company's headquarters in Cambridge, England. The subsidiary offices in America, France and Germany provide an additional service.

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